[Finalgenesis]

Their value to me has always been diversity, As SCs they aren't strictly that much better on a cost basis then other choices (assuming EDM or later CBM on), but for diversity they have no equal. They do take a lot of investment and time though as compared to the other summon and done SCs/casters, and with the no GoR in latest CBM they aren't really worth it, and marginal at best with grail or GoH.

They'll sooner or later kill the temple and do 100+ unrest hits (uncommon, but not that uncommon, especially if you have 3+ tarts in a prov), usually a good idea to designate a wasteland or super low pop province as a holding area for tarts (if you intend to build them up), stick a lab and either a fort and/or A+N dome it (or bad things can happen to them).